void show_alert(String title, String message) {
    Log.d("ipov","show_alert(+)");
    SMSDialogFragment smsDialogFragment = new SMSDialogFragment();
    smsDialogFragment.title = title;
    smsDialogFragment.message = message;
    smsDialogFragment.show(getFragmentManager(), "smsDialog");
    Log.d("ipov","show_alert(-)");
}

public class SMSDialogFragment extends DialogFragment {

public String title;
public String message;
/* The activity that creates an instance of this dialog fragment must
 * implement this interface in order to receive event callbacks.
 * Each method passes the DialogFragment in case the host needs to query it. */
public interface SMSDialogFragmentListener {
    public void onDialogPositiveClick(DialogFragment dialog);
    //public void onDialogNegativeClick(DialogFragment dialog);
}

// Use this instance of the interface to deliver action events
SMSDialogFragmentListener mListener;

// Override the Fragment.onAttach() method to instantiate the NoticeDialogListener
@Override
public void onAttach(Activity activity) {
    Log.d("ipov","dialog onAttach activity.getClass().getName()="+activity.getClass().getName());
    super.onAttach(activity);

    // Verify that the host activity implements the callback interface
    try {
        // Instantiate the NoticeDialogListener so we can send events to the host
        mListener = (SMSDialogFragmentListener) activity;
    } catch (ClassCastException e) {
        // The activity doesn't implement the interface, throw exception
        throw new ClassCastException(activity.toString()
                + " must implement SMSDialogFragmentListener");
    }
}


@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    if(savedInstanceState != null)
        Log.d("ipov","dialog onCreateDialog savedInstanceState.toString()="+savedInstanceState.toString());
    Log.d("ipov","dialog onCreateDialog getActivity().getClass().getName()="+getActivity().getClass().getName());

    // Use the Builder class for convenient dialog construction
    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
    builder.setTitle(title)
            .setMessage(message)
            .setPositiveButton("button_1", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    //mListener.onDialogPositiveClick(SMSDialogFragment.this);
                }
            })
            .setNegativeButton("button_2", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    // User cancelled the dialog
                }
            });
    // Create the AlertDialog object and return it
    return builder.create();
}

private class LoadSMSTask extends AsyncTask<Void, Void, String> {

    public AsyncResponse delegate = null;

    @Override
    protected String doInBackground(Void... params) {
        // получаем данные с внешнего ресурса
        processSmsForSender( account.getSMSSenderName() );
        return null;
    }

    @Override
    protected void onPostExecute(String strJson) {
        Log.d("ipov","LoadSMSTask onPostExecute(+)");
        super.onPostExecute(strJson);
        JSONObject dataJsonObj = null;
        // выводим целиком полученную json-строку
        try {
            dataJsonObj = new JSONObject(
                    "{n" +
                    "    "type": "smses_processed"n" +
                    "}n"
            );
        } catch (JSONException e) {
            e.printStackTrace();
        }
        delegate.onJSONReceived(dataJsonObj,null);
        //RFin.initMainScreen();
    }
}

public class AddAccount extends AppCompatActivity implements AsyncResponse, SMSDialogFragment.SMSDialogFragmentListener {
...
@Override
public void onJSONReceived(JSONObject jsonObject, String jsonErrorText){
    Log.d("ipov","onJSONReceived(+)");
    ...
    Log.d("ipov","onJSONReceived smses_processed show_alert");
                    show_alert("sms processig error", parsingErrors[i]);
...